JP3300046B2 - Container lid - Google Patents

Abstract

The sealing cap according to the invention has a pouring part (1) with a pouring aperture and a closure part (2) which is connected to the pouring part (1) so as to be limitedly pivotable about a pivot axis (Z). Passing around the pouring aperture on the inner and/or outer wall of said aperture are sealing surfaces which, in the closed state of the sealing cap, form sealing pairs of sealing surfaces together with corresponding sealing surfaces of the closure part. These pairs of sealing surfaces are at least partially curved with a concave curvature, seen from the pivot axis, so that they do not have to be deformed during the pivoting movement of the closure part (2). <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a container.

[0002]

2. Description of the Related Art Conventionally, for example, in a container made of a metal can or a cardboard coated with an inside and containing a fluid such as a liquid, a lid is provided so that a spout can be repeatedly opened and closed. The lid comprises a spout portion having a spout and a lid portion for opening and closing the spout. The lid is used by fitting it into an opening formed in the container, and a thermoplastic material is used as the material (Swiss Patent Application No. 2739 / 91-2).
Patent Specification and Swiss Patent Application No. 2740 / 91-9 (filing date: September 17, 1991).

The lid is formed by a multi-material injection molding method using two or more materials having at least one different property. Swiss Patent Application No. 2740 / 91-
In the lid described in the specification No. 9, in order to facilitate handling when the lid is normally used, the lid is not completely separated from the spout even when the spout is open. It has become. Therefore, one or two or more webs are formed on the lid portion, and the webs are used to make the web flexible.
The connection between the lid portion and the spout portion is provided with a property, or the connection between the lid portion and the container is provided.

[0004]

However, in the lid of the conventional container, since the spout or the container and the lid are connected to each other by the web, the position of the lid is kept in a state where the spout is opened. Cannot be stabilized, and the lid cannot be placed in the correct position. Therefore,
When closing the spout, an operation of adjusting the position of the lid portion to the spout portion is required in addition to the closing operation. And
If the closing operation is not performed accurately, the sealing surface outside or inside the spout portion is deformed, and extra force is required to close the spout.

In swinging the lid, the sealing surface of the lid interferes with the sealing surface of the spout, and the force required to swing is increased. The present invention solves the above-mentioned problems of the lid of the conventional container, maintains good airtightness between the lid portion and the spout portion in the closed state, and performs a single simple swing around the swing axis. The lid can be closed by operation, and when the lid is in a predetermined position with respect to the spout, the lid and the spout can be kept connected. It is an object of the present invention to provide a lid of a container in which only a portion which sometimes acts as an elastic locking means is deformed and a force required for swinging can be reduced.

[0006]

For this purpose, the lid of the container of the present invention is used for a container for containing a fluid and is made of a thermoplastic material. And it has a substantially cylindrical spout portion and a lid portion for opening and closing the spout of the spout portion. Further, the lid portion is swingably fixed to the spout portion within a limited range around a swing axis.

The spout portion has a sealing surface along the periphery of the spout and on at least one of the inside and the outside of the wall of the spout. Further, the lid portion has a sealing surface which forms a pair of sealing surfaces together with the sealing surface of the spout portion in the closed state. The pair of seal surfaces are formed so as to form a concave portion when viewed from the swing axis, and to be curved along a track on a circular orbit in a plane perpendicular to the swing axis. The lid has a shape that does not interfere when the lid swings around the swing axis.

In the lid of another container according to the present invention, the pair of sealing surfaces is formed such that the sealing surface of the lid portion is closer to the swing shaft than the sealing surface of the spout portion. In still another container lid of the present invention, the pair of sealing surfaces is formed of two materials.

[0009]

According to the present invention, as described above, the lid of the container is used for a container for containing a fluid and is formed of a thermoplastic material. And it has a substantially cylindrical spout portion and a lid portion for opening and closing the spout of the spout portion. Further, the lid portion is swingably fixed to the spout portion within a limited range around a swing axis. The spout portion includes a sealing surface along the periphery of the spout and on at least one of the inside and the outside of the wall of the spout. In addition, the lid portion,
A sealing surface that forms a pair of sealing surfaces with the sealing surface of the spout portion in the closed state. Then, the pair of sealing surfaces are formed in a plane perpendicular to the swing axis so as to form a recess when viewed from the swing axis, and
The lid portion is formed by bending along a track on a circular orbit, and has a shape that does not interfere when the lid portion swings around a swing axis.

In this case, the pair of sealing surfaces are curved in a plane perpendicular to the pivot axis so as to form a recess when viewed from the pivot axis and along a track on a circular orbit. The lid portion has a shape that does not interfere when the lid portion swings around the pivot axis, so that when the lid portion is pivoted, the lid portion relatively moves without any deformation.

In another container lid of the present invention, the sealing surfaces of the pair are formed so that the sealing surface of the lid portion is closer to the pivot shaft than the sealing surface of the spout portion. In this case, the lid portion can be swung while the pair of sealing surfaces are always in contact with each other. In the lid of still another container of the present invention,
Further, said pair of sealing surfaces is formed by two materials. In this case, the materials of the two sealing surfaces, the temperature or the shape of the molding stage are selected.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a container to which a lid according to an embodiment of the present invention is applied, and FIG. 2 is a sectional view of a sealing surface of the lid of the container according to the embodiment of the present invention. FIG. 2 (a)
Shows a first example of the sealing surface, (b) shows a second example of the sealing surface, and (c) shows a third example of the sealing surface.

In FIG. 1, 10 is a lid made of a thermoplastic material, 11 is a substantially cylindrical spout portion, and 12 is a lid portion for opening and closing the spout of the spout portion 11. The lid 10 is a lid composed of a spout portion 11 and a lid portion 12. The lid 10 is attached to a coated cardboard container 13. The spout and lid portion 12 have a substantially pentagonal shape, with a hinge 14 formed on one of the five sides. The lid part 12 is attached to the spout part 11 by the hinge 14, so that the lid part 12 can swing around the swing axis Z within a limited range.

As shown in FIG. 2, the pair of sealing surfaces are formed on the end face C of the wall of the spout portion 11, the outer wall surface D of the spout portion 11, or the inner wall surface E of the spout portion 11.
The pair of front sealing surfaces extending substantially perpendicular to the axis X of the spout, while the pair of sealing surfaces formed on the outer wall surface D and the inner wall surface E It extends substantially parallel to the axis X of the spout.

In this case, it is easy to move the lid portion 12 vertically upward and in parallel to the axis X of the spout to remove it from the spout portion 11. However, it is not easy to swing the lid portion 12 around the swing axis Z. That is, when the sealing surfaces of each pair are formed at right angles to the paper surface, the lid portion 12 can swing around a rotation axis arranged parallel to the paper surface outside the upper part of the spout. However, when the swing axis is not in the plane of the paper and extends, for example, at right angles to the plane of the paper, when the lid portion 12 is swung, the seal surfaces of each pair interfere with each other. If the shapes of the sealing surfaces are not corrected so as to correspond to each other, they will be deformed. The only sealing surface that is unaffected during swinging and simple upward movement is the front sealing surface.

In FIG. 2, Z indicates a swing axis perpendicular to the paper surface. The swing operation of the lid portion 12 is indicated by a solid line arrow, and the swing operation of the end of the sealing surface is indicated by a broken arrow. . As shown in the figure, it can be seen that the swing operation of the lid portion 12 is impossible. During swinging, the sealing surface on the lid portion 12 side is closer to the swing axis Z than the sealing surface on the fixed spout portion 11 side. Therefore, in the case of the configuration shown in the figure, the two sealing surfaces interfere with each other.

Therefore, in order to perform the swinging operation so that the sealing surfaces are not deformed, the sealing surfaces forming a pair are required to have the swing axis Z.
It must be curved so as to form a recess when viewed from above. That is, in each cross section perpendicular to the swing axis Z, the point of the seal surface on the side of the lid portion 12 farthest from the swing axis Z (hereinafter, referred to as “swing seal surface”) is an arc-shaped spout portion. The pair of sealing surfaces must be curved about the swing axis Z so as to move along the sealing surface on the eleventh side (hereinafter referred to as “fixed sealing surface”).

FIG. 3 is a plan view of a spout of a lid of a container showing an embodiment of the present invention. (A) of the figure shows a case where the spout is rectangular, (b) shows a case where the spout is triangular,
(C) shows the case where the spout is circular, and (d) shows the case where the spout is pentagonal. In the figure, a hinge 14 (FIG. 1) is formed so as to pass through the swing axis Z. In each example, the position of the lid portion 12 with respect to the swing axis Z changes,
Thereby, the inner wall surface E of the spout portion 11 is corrected, the outer wall surface D is corrected, or not corrected at all.

FIG. 4 is a plan view of the lid of the container of the present invention, and FIG.
FIG. 6 is a sectional view taken along line FF of FIG. 4. As shown in FIG.
0 (FIG. 1) has a pair of sealing surfaces formed on the outer wall surface D of the spout portion 11 and a pair of front sealing surfaces formed on the end surface C. As can be seen from FIG. 5, the seal surface in the wall region close to the hinge (oscillation axis Z) 14 is corrected.

FIG. 6 is an explanatory view for accurately correcting the pair of sealing surfaces. The lower half of the figure is a projection on a plane including the swing axis Z, and the upper half is a projection on a plane including an axis X (FIG. 2) of a spout (not shown) extending perpendicular to the swing axis Z. It is.
In the figure, the trajectory when the end of the oscillating seal surface completely passes over the fixed seal surface during the oscillating operation is shown.

When the lid 10 (FIG. 1) is in the closed state, the end of the swing seal surface is at the position a. Points P, Q and R on the position a (closed position) move along tracks P ', Q' and R 'on a circular orbit perpendicular to the swing axis Z. The radii of these tracks P ', Q', R 'are p, q, r, respectively, and are equal to the distance from the pivot axis Z to the points P, Q, R, respectively.

The surface formed by the tracks P ', Q', R 'corresponds to the corrected shape of the pair of sealing surfaces along the wall which forms an angle α with the pivot axis Z and is not corrected. In the state, it is parallel to the axis X of the spout. The corrected pair of sealing surfaces are formed in accordance with the complicated wall area and the shape of the sealing surface. FIG. 7 is a perspective view when the sealing surface of the spout portion of the lid of FIG. 1 is corrected.

As shown in the figure, the sealing surface F is not parallel to the axis X (FIG. 2) of the spout, but has a shape tapered with respect to the spout, and is surrounded by broken lines m and n. Correction is required only in the area where When the lid 10 (FIG. 1) is manufactured by a multi-material injection molding method, in the first molding step, the area of the spout portion 11, which is a preform, is preliminarily formed of the first material, and the next second molding is performed. In the step, the mold is at least partially moved, and the region of the lid portion 12 is molded with the second material to obtain a final molded product. In a second molding step, at least a part of the preform forms a mold.

In this way, the sealing surfaces of the two materials formed by forming the molding die are the material and the second material.
By selecting the temperature or the shape of the molding step, the connection can be made firmly or relatively moved. Therefore, the contact surfaces formed to form the molding die are accurately overlapped with no gap (clearance) to form a sealing surface.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0026]

As described in detail above, according to the present invention, the lid of a container is used for a container for containing a fluid and is formed of a thermoplastic material. And
It has a substantially cylindrical spout portion and a lid portion for opening and closing the spout of the spout portion. Further, the lid portion is swingably fixed to the spout portion within a limited range around a swing axis. And the spout portion is
A sealing surface is provided along the periphery of the spout and on at least one of the inside and the outside of the wall of the spout.
Further, the lid portion has a sealing surface which forms a pair of sealing surfaces together with the sealing surface of the spout portion in the closed state. The pair of seal surfaces are formed so as to form a concave portion when viewed from the swing axis, and to be curved along a track on a circular orbit in a plane perpendicular to the swing axis. The lid has a shape that does not interfere when the lid swings around the swing axis.

In this case, the pair of sealing surfaces are curved in a plane perpendicular to the pivot axis so as to form a recess when viewed from the pivot axis and along a track on a circular orbit. The lid portion has a shape that does not interfere when the lid portion swings around the pivot axis, so that when the lid portion is pivoted, the lid portion relatively moves without any deformation.

Therefore, the lid can be swung while the pair of sealing surfaces are always in contact with each other. Also, when the lid swings, only the portion acting as the elastic locking means is deformed, and the sealing surfaces of the pair are not deformed, so that the force required to swing can be reduced. In another container lid of the present invention, the pair of sealing surfaces is formed of two materials. In this case, by selecting the two materials, the two sealing surfaces can be firmly connected or relatively moved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a container to which a lid according to an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view of a sealing surface of a lid of a container showing an embodiment of the present invention.

FIG. 3 is a plan view of a spout of a lid of a container showing an embodiment of the present invention.

FIG. 4 is a plan view of a lid of the container of the present invention.

FIG. 5 is a sectional view taken along line FF of FIG. 4;

FIG. 6 is an explanatory diagram for accurately correcting a pair of sealing surfaces.

FIG. 7 is a perspective view showing a case where a sealing surface of a spout portion of the lid of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lid 11 Spout part 12 Lid part 13 Container 14 Hinge X Spout axis Z Swing axis

Continuation of the front page (56) References JP-A-5-201441 (JP, A) JP-A-5-201442 (JP, A) JP-A-5-213347 (JP, A) , U) Japanese Utility Model Showa 62-182245 (JP, U) Japanese Utility Model Showa 62-134842 (JP, U) Japanese Utility Model Hei 2-108826 (JP, U) Japanese Utility Model Utility Model 1-177124 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 45/16 B29D 31/00 B65D 5/74 B65D 25/42 B65D 43/16 B65D 47/08-47/10 B65D 51/20-51/22 B65D 77/30

Claims (3)

(57) [Claims] 1. A lid for a container for containing a fluid, the lid being made of a thermoplastic material, comprising: (a) a substantially cylindrical spout; and (b) the spout. A lid portion for opening and closing the spout of the portion, and (c) the lid portion is swingably fixed to the spout portion within a limited range around a swing axis, ) The spout portion along the perimeter of the spout,
And a sealing surface on at least one of the inside and the outside of the wall of the spout; and (e) the lid portion forms a pair of sealing surfaces together with the sealing surface of the spout portion in a closed state. (F) the pair of sealing surfaces are curved in a plane perpendicular to the pivot axis so as to form a recess when viewed from the pivot axis , and along a track on a circular orbit. Let me shape
Made that lid of a container said lid portion and having a shape that does not interfere with the time of swinging about the swing axis. 2. The container lid according to claim 1, wherein the pair of sealing surfaces are formed such that a sealing surface of a lid portion is closer to a pivot shaft than a sealing surface of a spout portion. 3. The pair of sealing surfaces are made of two materials.
2. The lid of the container according to claim 1, wherein the lid is formed.